高声压激励下多孔金属材料的吸声性能数值计算  

Numerical Calculation of Acoustic Properties of Porous Metal at High Sound Pressure Level

作　　者：张波[1,2] 陈天宁[1] 

机构地区：[1]西安交通大学机械工程学院 [2]宁夏大学机械工程学院

出　　处：《西安交通大学学报》2010年第3期58-62,132,共6页Journal of Xi'an Jiaotong University

基　　金：国家重点基础研究发展规划资助项目(2006CB601204);国家自然科学基金重点资助项目(10632060);宁夏高等学校科学研究项目

摘　　要：在Wilson数值方法的基础上,推导得到了多孔材料的声导纳率方程;采用标准四阶龙格库塔算法,构造了一种高声压激励下的多孔金属材料吸声性能数值计算方法.算例表明:该方法能够克服Wilson方法中计算网格长度需按照指数分布来划分的不足,采用较少的计算网格数同样能够较好地对多孔金属材料的吸声性能进行计算.研究还表明,入射波声压级的高低对多孔金属材料吸声性能有一定的影响,在无空气层的情况下,声压级对材料归一化表面声阻率的影响较大,对归一化表面声抗率的影响相对较小,而在有空气层时,高声强非线性对声抗率的影响渐趋显著.Sound admittance of porous material is deduced on the basis of Wilson numerical method.A numerical method for calculating the absorption property of porous metal at high sound pressure level（SPL） is developed by using a standard fourth-order Runge-Kutta algorithm.It is found that an exponential distribution in Wilson method for identifying the distance between discrete points of calculating meshes is unnecessary in the proposed method,and the sound absorption properties of porous metal at high sound pressure levels can be well evaluated with smaller number of meshes.The SPL of incident wave exerts greater influence on the acoustic resistance of porous metal than on the acoustic reactance in the case of porous material without air gap.However,for the case of porous material with an air gap,the influence of reactance on the acoustic properties of porous metal is enhanced gradually.

关 键 词：高声强 多孔金属 声导纳 数值计算 

分 类 号：TG502[金属学及工艺—金属切削加工及机床]